Abrading tool



Oct. 22, 19 N. H. KNOWLTON ABRADING TOOL Original Filed Oct. 4, 195':

Fig.1

Patented Oct.22, 1940 I ABRADING TOOL Norwood H. Knowlton, Rockport, Mass, assignor to United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation of New Jersey I Original application October 4, 1937, Serial No. 167,140. Divided and this application Septeme ber 28, 1938. Serial No. 232,123

6 Claims. This application relates to abrading tools and is herein illustrated and described as embodied in a buffing roll suitablefor operation upon shoe soles. The rolldisclosed herein may be used to advantage in machines for bufilng soles prior to their attachment to' shoes, I a machine of such typebeing illustrated andv described in my copending application Serial No. 167,140, filedOctober 4, 1937, of which this application is a division. The roll disclosed herein may likewise be used in machines for buffing shoe bottoms after the soles have beenattached.

It is an object' of the invention to provide an improved buffing tool capable of imparting a smooth, uniform finish to the surface of a sole. To this end the illustrated buffing roll is backed by a resilient cushion whichf-may be secured about the roll body under any desired degree of tension to avoid the formation of bulges which i might cause ripple marks on the surface of the work, and the abrasive cover itself may also be secured under tension for the same purpose. In accordance with a feature of the invention the roll body is in the form of a hollow metal cylinder having a pair of diametrically opposite slots extending its entire length, the roll surfaces between the slots being covered by a pair of sheets of resilient cushioning material, and means are provided for anchoring an edge of each cushioning sheet in one of the slots, and for securing the other edges of the sheets under any desired degree of tension in the other slot. The abrasive cover is wrapped about the roll in a single piece, its edges extending through the slot in which the edges of the cushioning sheet are anchored and being secured by atensioning device within the roll body.

These and otherfeatures of the invention will appear more fully from the following detailed 40 description when read in connection with the accompanying drawing, and will be pointed out in the appendedclaims.

Referring now to theaccompanying drawing, Fig. 1 is a longitudinal view partly in section of the improved buffing roll;

Fig. 2 is a cross-sectional view of the improved buffing roll;

Fig. 3 is an end view of the improved bufling roll;

Fig. Lisa detail showing in perspective of an arrangement of an edge portion of a resilient cushion for the abrasive cover; and

Fig. 5 is a detail showing in perspective of the arrangement of the opposite edge of the resilient 55 cushion.

The body portion of the roll is made up of sections comprising a hub 452, a radial flange 454 and a circumferential flange or rim 456, all of which may conveniently be made integral; also a similar hub 458, a radial flange 466 and a circumferential flange or rim 462 likewise integral. These two members are mounted side-by-side on the shaft I42 and separated from each other by a third relatively short membercomprising a hub 464, a radial flange 466 and a circumferential flange 468. These three members are held together by a pair of. circular end plates 416 and 412 connected to each other by a pair of tie rods' 414 which clamp together the various members toform a unitary structure. The clamping pressure is exerted through the rims 458, 462 and 468, which are continuous with each other, the hubs 452 and 458 being shorter than their corresponding rims to provide clearance between all of the hubs. The end plates 416 and 412 are each provided with a hub through which extend set screws 416 for securing the roll body upon the shaft I42. The rims 456, 462 and 468 which make up the periphery of the roll body thus formed are each slotted to provide a pair of diametrically opposed slots 418 and 480 which extend the length of the roll body.

The peripheral surface of the roll body is covered with a resilient pad or cushion in the form of a pair of sheets of sponge rubber 462 and 484 to the outer surface of each of which sheets is cemented a flannel cover 486. A reinforcing sheet or backing of tough relatively inelastic fabric 481 is cemented to the inner surface of each of the sponge rubber sheets 482 and 484. On

each side of the slot 418 and adjacent thereto is a bore 488 extending the length of the roll. Each of the bores 48B connects along its entire length through a relatively narrow slot with the slot 418. The fabric reinforcements 481 of the respective cushions 482 and 484 are extended beyond the opposite edges of each cushion. Stitched to one of the extended edges of each of the fabric reinforcements is a strip of leather welting 496 (Fig. 5). An end of the welting 496 is inserted into one end of one of the bores 488, with the adjacent portion 'of the fabric reinforcement extending through the above-mentioned narrow slot connecting that bore with the slot 418 and thence out through the slot 418. The welting and the fabric reinforcement are thus threaded lengthwise of the roll until the entire length of welting is within the bore. One end of each of the resilient cushions is thus anchored by its strip of welting, which is of suflicient thickness to prevent its being pulled through the relatively narrow connecting slot. The cushions 482 and 484, extend in opposite directions from the slot 4 18 half way around the periphery of the roll body until they reach the slot 480. The extension of the fabric reinforcement 48'! at that end of each of the resilient cushions 482 and 484 is wrapped around and secured to a strip of canvas belting 492 (Fig. 4) to provide a thick reinforced tab extending the length of the roll body. These two tabs extending from the respective cushions 532 and 48 are pressed together and are introduced between a pair of corrugated rolls 198 which are journaled in suitable bearings 96 formed in the end plates. The rolls 394 pass through openings in the radial flange 566 which support them against the tendency of centrifugal force to bow them outwardly. The ends of the rolls extending through the end plate 472 are provided with squared heads 498 to facilitate their being turned by suitable tools. The teeth of the rolls til i extend only partially through the full thickness of each of the tabs, and either roll may accordingly be turned independently of the other if necessary until both of the cushions are under equal tension. The rolls 494 are then secured in position by set screws 498.

Supported upon the periphery of the cushions Q32 and 58 i is an abrasive cover 568 of sandpaper or like material. The edge portions of this abrasive cover are pressed together and introduced between a pair of corrugated rolls 5132 which are journaled in suitable bearings Wt formed in the end plates 5'59 and M2, and which, like the rolls set, pass through and are supported by the flange 465. The ends of the rolls 5B2 extending through the end plate 3'52 are provided with squared heads 5% to facilitate turning by suitable tools. The teeth of the rolls 592 mesh through the sandpaper (without penetrating) and are turned simultaneously until the sand paper is under the desired tension. The rolls 502 are then secured against turning by set screws 5%.

It will be observed that in the roll construction above described there is no overlapping of either the sandpaper or its supporting cushions which might cause a bulge tending on each revolution of the buffiing roll to strike the work and cause Waves or ripple marks. The means for securing both the sandpaper and the resilient cushioning enable these elements when worn to be replaced quickly and easily. Moreover, the securing means enable both the sandpaper and the cushioning to be applied under the most suitable tension, and thus enable the operator to avoid bulges resulting from the local accumulation of slack in either the sandpaper or the cushioning member. Such bulges are not only a source of ripple marks, but they materially shorten the life of the sandpaper and of the cushioning. The tension in the cushion members is sustained by the fabric reinforcement 53? rather than by the rubber which might stretch indefinitely. The fabric reinforcement serves also to hold the rubber against expansion under the influence of centrifugal force.

Although the invention has been set forth as embodied in an abrading tool in the form of a roll, it should be understood that the invention is not limited in the scope of its application to the particular type of abrading tool which has been shown and described.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. An abrading roll comprising a roll body having in its periphery a pair of diametrically 0pposed longitudinal slots, a pair of sheets of resilient material covering the respective halves of the periphery of said roll body between said slots for cushioning an abrasive cover, means for anchoring an edge of each cushioning sheet in one of said slots, means for securing an edge of each cushioning sheet in the other of said slots, and means for adjusting said securing means to vary the tension of said cushioning sheets.

2. An abrading roll comprising a roll body having in its periphery a pair of diametrically opposed longitudinal slots, 2. pair of sheets of resilient material covering the respective halves of the periphery of said roll body between said slots, means associated with one of said slots for anchoring an edge of each sheet at the locality of that slot, means associated with the other of said slots for securing an edge of each sheet at the locality of that slot, an abrasive cover of she'et material surrounding said roll body and cushioned by said sheets, said abrasive cover having a pair of opposite edges extending into the slot at which the edges of said sheets areanchored, means engageable with said edges of said abrasive cover for varying the tension of the abrasive cover, and means associated with said sheet-securing means for adjusting the tension of said sheets.

3. In an abrading roll, a roll body having a pair of diametrically opposed slots, means engageable with the edge portions of an abrasive cover extending into one of said slots for tensioning the abrasive cover, and means engageable with the edge portions of a pair of cushioning members of sheet material extending into the other slot for tensioning the cushioning members, said roll body being constructed and arranged to provide for anchoring the opposite edges of the cushioning members extending into the slot into which extends also the abrasive cover.

4. A resilient cover for a buifing tool comprising a sheet of rubber, a reinforcement of tough relatively inelastic sheet material cemented to one surface of said rubber sheet, and a facing of fiannel cemented to the opposite surface of the rubber sheet.

5. An abrading roll comprising a roll body, a pad of sheet rubber surrounding said roll body for cushioning an abrasive cover, a backing of tough relatively inelastic sheet material between said pad and said roll body, said pad being secured over substantially its entire area to said backing and having a pair of adjacent edges extending across said roll body, said roll body having a slot beneath the adjacent edges of said pad, said backing extending beyond each of said adjacent edges of said pad, the extended portions of said backing entering said slot, means within the roll body for securing the extended portions of the backing, and means for adjusting said securing means to vary the tension of the backing.

6. An abrading roll comprising a roll body. having a longitudinally extending slot in its periphcry, a resilient cover for cushioning an abrasive cover on said roll body, said resilient cover surrounding said roll body and consisting of a sheet of sponge rubber having attached to one of its surfaces a reinforcement of relatively tough inelastic sheet material extending beyond two opposite edges of the rubber sheet and into said slot, a pair of corrugated rolls within said roll body constructed and arranged to grip between them the extending portions of said reinforcement, said rolls being rotatable to adjust the tension of said cover, and means for securing said rolls in adjusted position.

NORWOOD H. KNOWLTON. 

